A lock nut should go on a bolt before a washer or the nut.
Yes, if one has been fitted.
You need a pipe wrench. Try to borrow-they are pricey.
If the truck has disk brakes in the back then you have to adjust the emergency brake cable underneath the vehicle by loosening the outer lock nut then tightening the adjuster nut and then you re-tighten the outer lock nut down to the adjuster nut.
The Socket Size for a 2001 Sephia Is a 32 mm
look under driver side by ddoor,unscrew lock nut and tighten other screw until brake is good,then tighten lock nut.
A lock washer overlaps itself when it is new so that when you tighten the nut down the pressure causes it to flatten out and in turn put pressure against the nut and whatever it is against. The pressure plus the gap in the washer helps prevent the nut from turning.
removal of ammo tube also permit removal of bolt . loosen the lock nut and loosen the screw which is locked by the lock nut.
M12 1.5mm
the day after a important nut loosened and fell off
with the lug wrench!
there is a retaining nut or clip on the back of the lock that holds it in place. remove the door panel and see what is broke or if the nut has loosened,and fell off. check the bottom of the door. It may be there waiting there to be found. hope it helps. duboff
Try using vice grips. This is a tool that looks like pliers, however it has a very strong lock on the handle which helps the jaws of the pliers to hold onto the nut enabling you to take the nut off.